Hedd you have hawks eyes to spot the 4 speed box, what you can't see is it's a Andrew Bird box saloon close ratio. That pipe is a map reading light as the RN doesn't have a dash light. However due to the scarcity of public conveniences we have a solution behind the drivers seat. When I got the car there was a very roughly cut hole there, as I suppose many Sevens had, so after tidying it up I made a cover plate.
I was shown this arrangement on a unrestored RN many years ago and the choke cable isn't in contact with the pipe, as the strap doesn't support the pipe I assume it's to stop the pipe's lateral movement.